Surface-modified metal oxide particle material, dispersion liquid, silicone resin composition, silicone resin composite body, optical semiconductor light emitting device, lighting device, and liquid crystal imaging device
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[0157]In Examples A1 to A5 and Comparative Examples A1 to A4, heat resistance of a silicone resin composite was evaluated by applying a load to the above-described composite (cured material) having a thickness of 0.5 mm in an electric furnace at 150° C. for 500 hours and then measuring a transmittance using a spectrophotometer (integrating sphere). The case where a transmittance at a wavelength of 450 nm after thermal loading was reduced by 30% or more as compared with an initial value (before thermal loading) was defined as “B”, and the case where a reduction amount was less than 30% was defined as “A”.
Example
[0158]Meanwhile, in Examples B1 to B5 and Comparative Examples B1 to B6, the evaluation was performed by using a composite (thickness: 0.5 mm) of each of the Examples formed on a glass base material and using a spectrophotometer (integrating sphere) to measure a transmittance. Specifically, a silicone resin composite was put into a dryer at 120° C., and after elapsing 1,000 hours, a transmittance at 450 nm was compared with an initial transmittance. The case where a reduction rate of transmittance relative to the initial value was less than 5% was defined as “A”; the case where it was 5% or more and less than 25% was defined as “B”; and the case where it was 25% or more was defined as “C”.
(Gas Permeability (Gas Barrier Properties) of Silicone Resin Composite)
[0159]Gas permeability (gas barrier properties) of a silicone resin composite was evaluated in the following manner.
[0160]First of all, an LED package having a silver-plated reflector was sealed with a silicone resin composition...
Example
[0161]Meanwhile, in Examples B1 to B5 and Comparative Examples B1 to B6, blackening of an appearance of the above-described silver-plated reflector (corrosion (blackening discoloration) of silver plate by sulfur gas) was observed through visual inspection and evaluated in terms of a time required for reaching the same degree as that in a separately fabricated standard plate (plate prepared by blackening a silver-plated reflector directly with a sulfur gas). Incidentally, the lower the gas barrier properties of the composite, the shorter the time required for reaching blackening was.
(Hardness Evaluation of Silicone Resin Composite)
[0162]With respect to the hardness evaluation of a silicone resin composite, at the time of fabricating a silicone resin composite, the case where no crack was generated was defined as “A”, and the case where a crack was generated was defined as “B” (Examples B1 to B5 and Comparative Examples B1 to B6).
(Thickness of Sealing Layer Made of Silicone Resin Comp...
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